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(7/20)*x = 28/5 // - 28/5
(7/20)*x-(28/5) = 0
(7/20)*x-28/5 = 0
7/20*x-28/5 = 0 // + 28/5
7/20*x = 28/5 // : 7/20
x = 28/5/7/20
x = 16
x = 16
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